Disk edge deburring machine



Septl, 1953 F, c.'wA| LAcE l 2,550,458

DISK EDGE DEBURRING MACHINE Filed April 24, 1952 INVENToR. 'f/PAAM* C?M14 4c! Patented Sept. 1, 1953 DISK EDGE DEBURRING MACHINE Frank CharlesWallace, North Hollywood, Calif., assignor to Collins Radio Company,Cedar Rapids, Iowa, a corporation Aof Iowa Application April 24, 1952,Serial No. 284,099

This invention relates in general to disc edge grinding means and inparticular to apparatus for removing burrs from the outer edge of discs.

Mechanical filters made according to the principles disclosed in theco`pending patent application of Melvin L. Doelz entitled MechanicalFilters, filed September 24, 1951., Serial Number 248,011, require aseries of metal discs which `serve as the frequency determining elementsof the filters. The physical dimensions of such discs are quitecritical. In construction of mechanical lilters, according to thepreviously referenced Doelz application, applicant has found itdesirable to produce discs by cutting them from rod stock of suitablematerial, as for example Nispan C which is a nickel alloy. Such cuttingoften-times leaves the discs with burrs about their outer peripherieswhich affect the frequency characteristics of the disc.

It is an object of this invention, therefore, to provide a disc edgedeburring machine which will remove the rough edges from a plurality ofdiscs.

Another object of this invention is to provide a disc edge deburringmachine that will quickly iinish the edges of a plurality of discs.

A feature of this invention is found in the provision for a pair ofabrading wheels mounted adjacent each other and driven at differentspeeds with a plurality of discs held between the wheels by guide means.

Further objects, features and advantages of this invention will becomeapparent from the following description and claims when read in View ofthe drawings, in which;

Figure 1 is a top view of the disc edge deburring machine with the guideroller pivoted upwardly;

Figure 2 is a top view of the disc edge deburring machine with the guidemember pivoted downwardly to the operating position; and

Figure 3 is a sectional view taken on line 3-3 of Figure 2.

Figure 1 shows a base plate IIJ which has mounted thereon upwardlyextending end plates II and I2. A rst roller I3 of relatively large sizeis mounted between the end plates II and I2 on an axle I4. A drivinggear I6 is attached to the axle I4 and meshes with a gear I1 connectedto the output shaft of a suitable driving means, as for example anelectric motor I8.

A second roller I9 is rotatably supported between the end plates II andI2 and is attached to an axle 2| which extends through the plate I2 andis connected to a gear 22 which is larger in size than the gear I6.

2 Claims. (Cl. 51`-103) The gear 22 meshes with gear I1 and is driven bythemotor IB. The roller I9 is smaller than the roller I3. The rollers I3and I9 are covered with an abrasive material, as for example, emerycloth which is designated as 23 and 24, respectively, in Figure 3. Theemery cloth may be glued to the rollers or attached in any other wellknown fashion.

Rotatably supported between the end plates II and I2, 'adjacent therollers I3 and I9, is a guide means 26. The guide means 29 is supportedon an axle 21 which has a lever arm 28 extending therefrom. A Weight 29is mounted to the outer end of arm 28.

As best shown in Figure 2, a pair of generally rectangular brackets 3|and 32 are rotatably supported adjacent each end on the axle 21 and ashaft 33 is rotatably supported between the outer end of the brackets 3Iand 32 in suitable bearings. 'I'he brackets 3l and 32 are pivotallyconnected to the axle 21 so that the holding assembly may be movedrelative to the rollers I3 and I9.

Slidably and rotatably mounted on the shaft 21 are a pair of brackets 34and 36, respectively, which have knurled collars 31 and 38,respectively, attached thereto and fitted about the axle 21. The outerends of the brackets 34 and 36 encompass the shaft 33. As best shown inFigure 3, the brackets 34 and 36 have downwardly extending projections35 that extend below the axle 33 in the operating position.

A plurality of discs 39 are supported between the rollers I3 and I9.

In operation, the axle 33 is pivoted upwardly to the position shown inFigure l and a. number of discs 39 which are t0 be deburred are placedin the valley between the rollers I3 and I9. The holding means is thenpivoted to the position shown in Figure 2 and the knurled brackets 31and 38 are pressed toward each other so as to hold the discs together.

The weight 29 applies a holding force to the axle 33 through thebrackets 3| and 32. The motor is started and causes the rollers I3 andI9 to turn. The gearing as shown causes the rollers I3 and I9 to move inthe same direction of rotation with the roller I3 traveling atapproximately twice the angular velocity of the roller I9. It is thisdierence in angular velocity, as Well as the difference in diameters ofthe rollers I3 and I9, which removes the burrs.

After a predetermined time the motor may be stopped and the lever arm 28pivoted to the position shown In Figure 1 and the discs removed.

It is seen that this invention provides means for quickly and accuratelydeburring a plurality of discs While maintaining their symmetricalcharacteristics.

Although the invention has been described with respect to a preferredembodiment thereof, it is not to be so limited as changes andmodifications may lbe made therein which fare within the full intendedscope of the invention, as dened by the appended claims.

I claim:

1. A disc edge grin-ding means nomprising, v:a base plate, a pair of endplates attached to the base plate, a first roller rotatably supported-between said end plates, a second rller'retatably supported betweensaid end plates adjacent the iirst roller, a driving means Ygearedy'to-said ifirst and second rollers to drive the first roller atapproximately twice the angular rate of the .second roller, said`first-roller having a diameter usubstantia'lly twice that of the secondrller, an v:axle pivotally supportedbetweenfsaid end plates, apair ofbracketssupportedby saidaxle, a shaft supported between the ireeren'dsAof lsaid brackets, and dasecond pair-of brackets slidably supported `onssa-id axle @and said ysha'ftvand engageable with said plurality ofdiscs to preventthem-from movl.ing :longitudinallyof said rollers.

2. .A disc edge grinding :means (comprising, Aa Dbase plate, fa fpairLof -end yplates attached V-to the base plate, a rst roller rotatablysupported between said end plates, a second roller rotatably supported:between said end plates adjacent the first roller, a driving meansgeared to said iirst and second rollers to drive the rst roller atapproximately twice the angular rate of the second roller, said rstroller having a diameter 'substantially `twice thatof the second roller,:an axle pivotally supported "between said end plates, a pair ofbrackets supported by said axle, a shaft supported between the free endsof said brackets, 'a second pairof brackets slidably supported on saidaxle and said shaft and engageable with sai-d plurality 4of `discs toprevent them from moving `flongitudnallyvdf said rollers, a lever armattached to said axle, and a weight attached to the end of saidleverarm'to-bias it in one direction.

FRANK CHARLES WALLACE.

References Cited in fthe le of this patent UNITED STATES PATENTS NumberName Date 1335,333 Olson Nov. 12. :1929 2;465,-178 Sommer Mar. 22, 19492,497,076 Ferguson Feb. :14, 11950 FOREIGN PATENTS Number Country Date152,632 .GreatBritain. May A18, 1'92'0

